# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html
import threading

from scrapy import signals
# useful for handling different item types with a single interface
from scrapy.downloadermiddlewares.retry import *

from apps.siku.siku.siku_tools import SiKuTools


class SikuSpiderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, or item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Request or item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info("Spider opened: %s" % spider.name)


class SikuDownloaderMiddleware(RetryMiddleware):
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.
    def __init__(self, settings):
        super().__init__(settings)
        self.siku_tools = SiKuTools()

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls(crawler.settings)
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def gen_new_request(self, request, exception, spider):
        if "https://jzsc.mohurd.gov.cn/APi/webApi/dataservice/query/comp/list" in request.url:
            token_data = self.siku_tools.get_ip_headers()
        else:
            token_data = self.siku_tools.get_access_token_from_cache()
        request.meta['token_data'] = token_data
        request.meta['proxy'] = token_data['proxies'].get("http")
        request.meta['http_proxy'] = token_data['proxies'].get("http")
        request.meta['proxies_info'] = token_data['proxies']  # 代理原始信息
        request.headers[b"User-Agent"] = token_data['User-Agent']
        request.headers[b"Accesstoken"] = token_data['access_token']
        return self._retry(request, exception, spider)

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        self.gen_new_request(request, 'init', spider)
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        # 解密返回内容
        response = response.replace(body=self.siku_tools.decrypt(response.body.decode("utf-8")).encode("utf-8"))
        if 'token失效' in response.text:
            if 'token_data' in request.meta:
                self.siku_tools.remove(request.meta['token_data'], reason='token失效')
            return self.gen_new_request(request, 'token失效', spider)
        if response.status in [400, 403]:
            if 'token_data' in request.meta:
                self.siku_tools.remove(request.meta['token_data'], reason=f'status_code is {response.status}')
            self.delete_dupefilter_request_seen(request, spider)
            return self.gen_new_request(request, f'status_code is {response.status}', spider)
        self.add_dupefilter_request_seen(request, spider)
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        spider.logger.error("process_exception: %s" % exception)
        if 'token_data' in request.meta:
            self.siku_tools.remove(request.meta['token_data'], reason=f'process_exception: {exception}')
        self.delete_dupefilter_request_seen(request, spider)
        return self.gen_new_request(request, exception, spider)

    def delete_dupefilter_request_seen(self, request, spider):
        dupefilter_cls = spider.crawler.engine.slot.scheduler.df
        fp = dupefilter_cls.request_fingerprint(request)
        spider.logger.warning(f'delete_dupefilter_request_seen: {fp} {request.url}')
        if getattr(dupefilter_cls, 'server', None):
            dupefilter_cls.server.srem(dupefilter_cls.key, fp)

    def add_dupefilter_request_seen(self, request, spider):
        dupefilter_cls = spider.crawler.engine.slot.scheduler.df
        dupefilter_cls.request_seen(request)

    def spider_opened(self, spider):
        spider.logger.info("Spider opened: %s" % spider.name)
